LIU Yuguo, MA Zhikan. TECHNIQUES OF DRILLING HIGHLY VERTICAL BORE-HOLES WITH CONVENTIONAL EQUIPMENTS[J]. COAL GEOLOGY & EXPLORATION, 1996, 24(3): 56-59.
Citation:
LIU Yuguo, MA Zhikan. TECHNIQUES OF DRILLING HIGHLY VERTICAL BORE-HOLES WITH CONVENTIONAL EQUIPMENTS[J]. COAL GEOLOGY & EXPLORATION, 1996, 24(3): 56-59.
LIU Yuguo, MA Zhikan. TECHNIQUES OF DRILLING HIGHLY VERTICAL BORE-HOLES WITH CONVENTIONAL EQUIPMENTS[J]. COAL GEOLOGY & EXPLORATION, 1996, 24(3): 56-59.
Citation:
LIU Yuguo, MA Zhikan. TECHNIQUES OF DRILLING HIGHLY VERTICAL BORE-HOLES WITH CONVENTIONAL EQUIPMENTS[J]. COAL GEOLOGY & EXPLORATION, 1996, 24(3): 56-59.
TECHNIQUES OF DRILLING HIGHLY VERTICAL BORE-HOLES WITH CONVENTIONAL EQUIPMENTS
Some problems about drilling highly vertical bord-holes with conventional drilling tools,including the construction technic,were discussed and solved.The optimal drilling parameters were selected to apply successfully to the construction of the vertical bore-holes.As a result,the inclinations of the vertical bore-holes are all less than 0.035°
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